Method and equipment for producing flange type lining plastic compound steel pipe

Abstract

The invention discloses a method and equipment for producing a lining plastic compound steel pipe, and in particular relates to a method and equipment for producing a flange type lining plastic compound steel pipe. The technical problem to be solved by the invention is to provide the method and the equipment for producing the flange type lining plastic compound steel pipe which enables the inner walls of a plastic pipe and a steel pipe to be compounded into a whole through a hot melt adhesive, ensures no separation and delamination phenomena occurred between steel and plastics and has stable and reliable product quality, the plastic pipe is towed to penetrate into the steel pipe through a towing device, the plastic pipe clings to the steel pipe through compressed air, and then the hot melt adhesive on the outer wall of the plastic pipe is molten and bonded with the steel pipe through an electromagnetic induction heating device. The inside of the plastic pipe is pressurized by adopting compressed air, so that the plastic pipe is expanded to enable the plastic pipe and the steel pipe to be in the state of interference fit, and then the steel pipe is heated at the moment by adopting an induction heating ring, so that the plastic pipe and the steel pipe are compounded into a whole, the steel and plastic materials in the pipes are more tightly bonded, and the separation and delamination phenomena between the steel and the plastics can not occur.

Description

technical field [0001] The present invention relates to a production method and equipment for a plastic-lined composite steel pipe, and more particularly relates to a production method and equipment for a flange-type plastic-lined composite steel pipe. Background technique [0002] In the prior art, the production technologies of flanged plastic-lined composite steel pipes with flange connection mainly include "plastic coating method" and "rotomolding method". The basic method of the "plastic coating method" technology is to weld the flanges at both ends of the steel pipe and heat it to a certain temperature, then send the plastic powder to the heated steel pipe and fill it with plastic powder, so that the plastic powder is melted by the heated steel pipe. A layer of plastic film is coated on the inner wall of the steel pipe; the basic method of the "Rotational Molding" technology is to put plastic powder into the steel pipe with welded flanges at both ends, and then heat th...

AI Technical Summary

Problems solved by technology

Because the inner plastic film layer of the plastic-lined composite steel pipe produced by the "plastic coating method" and "rotomolding method" is relatively thin, it is difficult to control the uniformity of the coating layer, and the coating layer is prone to pinhole defects; and the plastic coating layer and the inner wall of the steel pipe Connection, hot melt adhesive without polar connection factor, but mechanically "embedded" in the pores of the inner surface of the steel pipe by hot-melt plastic powder after solidification, forming many tiny mechanical connections When used in an environment, the plastic coating layer will fall off due to the large difference in the linear expansion coefficient between steel and plastic

Images